Rocket Espresso
Restricted Brew Flow / Scale Buildup
Weak water flow from group head, shots run very slowly even with coarse grind and no puck channeling.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Scaled heat exchanger (HX) passages, Partially blocked gicleur, Scale in brew solenoid valve, Dirty group head and dispersion plate
How to Fix / Troubleshooting
Safety first: Unplug and cool the machine before removing any parts.
- Eliminate coffee variables: Test flow with an empty portafilter or no portafilter. If flow is still weak, the restriction is in the machine.
- Deep clean group: Remove and clean the shower screen and dispersion plate. Backflush thoroughly with detergent as per manufacturer guidelines.
- Descale (if appropriate): If the machine has not been descaled and you have hard water, consider a controlled descaling procedure following Rocket's recommendations. Avoid aggressive descaling on heavily scaled machines without professional guidance, as it can dislodge large particles.
- Inspect gicleur (advanced): The small jet (gicleur) in the E61 group can be removed and cleaned with a fine wire. This requires careful disassembly; if unsure, consult a technician.
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Repair Difficulty
Medium
3/5
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